Mugen rear lip

Anybody know why a 90-91 rear lip won’t fit on a 92-93 bumper? I want to put a lip kit on but can’t find anything for the rear, except for the 90-91 rear lip. Any help would be awesome.

Bumper shape is different. It’s pretty obvious.

I don’t have a side by side comparison to look at. Just trying to figure out how hard its gonna be to mod into fitting. Unless you know of a rear lip for the 92-93?

heres how it looks like on a 92-93 rear bumper. got it from a friend who crashed his 91.
the lip cracked in half but it cracked where i want it so yea.
the lip has to be force or hot gun to bend to fit.

look carefully so you’ll see how the lip doesnt fit well.